Developed over the last decade, AcousticCalc helps designers predict sound levels at the room level from a distant sound source. The program uses the ASHRAE Handbook and ASHRAE's 1991 Algorithms for HVAC Acoustics handbook methods with the “Source-Path-Receiver” model. This easy-to-use Windows-based program allows a user to define and save unlimited number of sound sources, save and define unlimited number of sound “paths” (composed of long list of possible duct component types) and model the ceiling effect and three different models for room effect.  AcousticCalc allows a user to import and export (share) sound sources, user-defined devices, terminal units, and duct silencers with other users. Easy-to-navigate “tree” modeling allows an unlimited number of sound sources, paths and rooms.

AcousticCalc allows the user to create multiple scenarios, so the designer can optimize the design for the acoustical criteria of a given room or space.

AcousticCalc also allows the user to “mark” component breakout sound for calculation and inclusion, if the designer deems the component to be located such that breakout sound should be considered.

Reports and graphs from AcousticCalc include:

  • Report: Project Cover Sheet
  • Report: Project Summary with Results
  • Report: Source, Path and Room Details
  • Graph: NC Sound Plotting with NC Value Displayed
  • Graph: RC Sound Plotting with RC Value Displayed
  • Graph: NCB Sound Plotting with NCB Value Displayed
  • Graph: RC Mark II Sound Plotting with RC Mark II Value Displayed

Screen Shots


HVAC acoustics, sound level prediction, noise level



Expertise Required

A basic understanding of HVAC acoustics


Newly Released, so <10 in the United States (as of July 4, 2012)


HVAC designers, acousticians, educators, and students


Description and input data of sound sources, sound paths (duct components), and room information


Data and results can be viewed on screen or printed reports (Cover Sheet, Summary & Detail) or printed graphs (NC, RC, NCB, and RC Mark II)

Computer Platform

Windows NT, XP, Vista, or 7. Hardware should be 486 or higher, 8 MB RAM, 30 MB free hard disk space, VGA or higher resolution monitor (SGVA 256-color recommended).

Programming Language

Visual Basic


Performing “Source-Path-Receiver” acoustical analysis involves a multitude of complex mathematical equations. AcousticCalc turns this complex and painful process into a simple point-and-click process and performs the analysis on screen in seconds. As sound sources, paths, or rooms are added, AcousticCalc updates all calculations and provides real-time calculations and results updates, which can be plotted onto any of the four graph types at any time during the design process.

AcousticCalc is available as a DLL (Dynamic-Link-Library), which can communicate with Microsoft Excel or any Windows-based parent program.


The user is required to have a basic HVAC acoustic understanding and must provide detailed information about sound sources, paths, and rooms.





PO Box 2076
Edmond, OK 73034
United States


(405) 513-8537


(405) 513-8537




AcousticCalc can be purchased for $299 for a single computer license. Multicomputer licenses are available and are heavily discounted, depending on the number of computers. Educators and students can contact for educational purpose discounts. There is NO yearly renewal fee. AcousticCalc provides the user unlimited free email technical support.

AcousticCalc DLLcan be purchased for $599 and is royalty free (no additional fees)